C70 Audio System Failure

That's tricky! It could be more than just the speaker. Have you tried other audio sources like the radio, auxiliary input, or Bluetooth to see if anything comes through? Did you notice any strange distortion before it went silent? Maybe a fuse?

All audio sources are silent. There's no output, and there wasn't any distortion beforehand. I checked the fuses, and they're fine. Does it still sound like a speaker issue, or could it be something else in the C70's audio system?

Okay, if all sources are dead and the fuse is good, it sounds like a speaker or amplifier issue. It's tough to pinpoint without specialized equipment. A bad bass speaker taking the whole system down isn't unheard of. I'd recommend taking it to a workshop. They'll have the right tools to diagnose it.

The workshop visit confirmed it was a defective bass speaker. The repair cost 280€. Thanks for helping confirm the likely problem.